“The only thing more dangerous than an idea is a belief. And by dangerous I don't mean thought-provoking. I mean: might get people killed.”
Source: The Wordy Shipmates
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Sarah Vowell 35
American author, journalist, essayist and social commentator 1969Related quotes

Daniel T. Gilbert (2007) in: John Brockman. What is your dangerous idea?: today's leading thinkers on the unthinkable. Harper Perennial, 2007, p. 42

“Nothing is more dangerous than an idea, when you have only one idea.”
Propos sur le Religion no. 74 (1938), under the pen name Alain.
Alternate translation: “Nothing is more dangerous than an idea, when it's the only one we have.” IZQuotes https://izquotes.com/quote/%C3%A9mile-chartier/nothing-is-more-dangerous-than-an-idea-when-you-have-only-one-idea-390165 (retrieved 10/30/18).

“There’s nothing more dangerous than a good idea.”
Ron English's Fauxlosophy (2016)

Source: 1850s, Attack upon Christendom (1855), p. 121

When asked how the world had changed following the September 11, 2001 attacks
Has the world changed? http://books.guardian.co.uk/writersreflections/story/0,1367,567546,00.html, The Guardian (October 11, 2001)